2010 Lexus IS 250 Owners Manual - Page 634

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6-1. Specifications

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Temperature A, B, C

The temperature grades are A (the highest), B, and C, representing

the tire's resistance to the generation of heat and its ability to dissipate

heat when tested under controlled conditions on a specified indoor

laboratory test wheel.

Sustained high temperature can cause the material of the tire to degenerate

and reduce tire life, and excessive temperature can lead to sudden tire fail-

ure.

The grade C corresponds to a level of performance which all passenger car

tires must meet under the Federal Motor Vehicle Safety Standard No. 139.

Grades B and A represent higher levels of performance on the laboratory

test wheel than the minimum required by law.

Warning: The temperature grades for this tire are established for a tire that

is properly inflated and not overloaded.

Excessive speed, underinflation, or excessive loading, either separately or in

combination, can cause heat buildup and possible tire failure.

Glossary of tire terminology

Tire related term

Meaning

Accessory weight

The combined weight (in excess of those standard

items which may be replaced) of automatic transmis-

sion, power steering, power brakes, power windows,

power seats, radio and heater, to the extent that these

items are available as factory-installed equipment

(whether installed or not)

Cold tire inflation pres-

sure

Tire pressure when the vehicle has been parked for

three hours or more, or has not been driven more

than 1 mile or 1.5 km under that condition

Curb weight

The weight of a motor vehicle with standard equip-

ment, including the maximum capacity of fuel, oil and

coolant, and if so equipped, air conditioning and

additional weight optional engine